How to Find Unencrypted AWS EFS File Systems

EFS file systems should be encrypted at rest to prevent exposure of sensitive data to bad actors.

info

This security check is part of the CIS Amazon Web Services Benchmarks and is rated severity medium.

Prerequisites

This guide assumes that you have already installed and configured Fix Inventory to collect your AWS resources.

Directions

1. Execute the following search command in Fix Inventory Shell:

   > search is(aws_efs_file_system) and volume_encrypted==false
   ​kind=aws_efs_file_system, ..., region=fixinventory-poweruser
   ​kind=aws_efs_file_system, ..., account=poweruser-team

2. Pipe the search command into the dump command:

   > search is(aws_efs_file_system) and volume_encrypted==false | dump
   ​reported:
   ​  id: /aws/efs/123
   ​  name: some-name
   ​  ctime: '2022-12-05T22:53:14Z'
   ​  kind: aws_efs_file_system
   ​  age: 2mo28d

   The command output will list the details of all non-compliant aws_efs_file_system resources.

Remediation

• Enable encryption at rest for EFS file systems.
• Encryption at rest can only be enabled during the file system creation.

note

Please refer to the AWS EFS documentation for details.

Further Reading

• Search
• Command-Line Interface
• aws_efs_file_system Resource Data Model

External Links

• CIS Amazon Web Services Benchmarks
• AWS Documentation